用0.3焦点进行X线直接放大摄影时,若焦一片距为90cm,肢一片距为30cm,则放大率是A.3B.2C.1.66D.1.5E.1.33

作者: rantiku 人气: - 评论: 0
问题 用0.3焦点进行X线直接放大摄影时,若焦一片距为90cm,肢一片距为30cm,则放大率是
选项 A.3 B.2 C.1.66 D.1.5 E.1.33
答案 D
解析 :根据公式K=l+a/h,K为影像的放大率。a为肢一片距。h为焦一肢距。得出K=1+3/6=1.5。

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